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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 7 |
| 3 | 31 |
| 4 | 211 |
| 5 | 2311 |
| 6 | 43891 |
| 7 | 1272811 |
| 8 | 47093971 |
| 9 | 2213416591 |
| 10 | 148298911531 |
| 11 | 15274787887591 |
| 12 | 2734187031878611 |
| 13 | 522229723088814511 |
| 14 | 116457228248805635731 |
| 15 | 31559908855426327282831 |
| 16 | 9247053294639913893869191 |
| 17 | 2931315894400852704356533231 |
| 18 | 1691369271069292010413719673711 |
[3,7,31,211,2311,43891,1272811,47093971, 2213416591,148298911531,15274787887591, 2734187031878611,522229723088814511, 116457228248805635731,31559908855426327282831, 9247053294639913893869191, 2931315894400852704356533231, 1691369271069292010413719673711] |